Is there a way to get Project from View unwrap to work with modifiers without applying them?
I found a solution if anyone sees/needs this, you can make duplicates of the object, pose them, apply the armature modifier, then do a Project from View unwrap for both of them. Then use Transfer UV Maps(Ctrl + L) to transfer them back to the original mesh.
(https://docs.blender.org/manual/en/2.80/editors/uv/layout_management.html)